Boston Red Sox — Kenley Jansen
David Butler II-USA TODAY Sports
Lifetime Stats (through 2023): 420 saves, 45-34, 2.52 ERA, 1159 SO
Boston’s future Hall of Famer built his legacy across the country. At his peak, Kenley Jansen was the game’s best closer and possessed baseball’s best cutter since Mariano Rivera. From 2010-17, Jansen posted a 2.08 ERA with 230 saves and a 0.872 WHIP. The star closer struck out 14.0 batters per nine innings, and finished fifth for the NL Cy Young — and 15th for MVP — in ’17. An intimidating presence on the mound, Jansen has implemented more off-speed pitches in recent years as his velocity has dipped. By the time his career comes to an end, Jansen could become the third closer to reach 500 saves.